Bear Grylls with the Duchess of Cambridge at a scout event at Windsor Castle Credit: Ben Gurr/The Times/PA Wire

Chief Scout Bear Grylls is flying into Cumbria to join more than 2,500 youngsters for a County Fun Day.

The event is taking place at the Westmorland County Showground near Kendal.

Bear will fly in by helicopter as part of his "Bear in the Air" campaign to visit every area of the UK during his time as Chief Scout.

The young people will include Beaver Scouts, aged 6 to 8, Cub Scouts, 8 to 10, Scouts, 10 to 14, Explorer Scouts, 14 to 18 and members of the Scout Network, aged 18 to 25. Events include a massive It's a Knock Out, a climbing wall and circus skills.

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he Duchess of Cambridge braved the snow to visit a Scout camp. Credit: PA Wire

Wrapped up against the biting cold, the Duchess of Cambridge arrived wearing a green woollen hat, fleece, green parka-style jacket, dark blue jeans and wellies with a Scout's red, white and blue neckerchief, tied in a friendship knot.

The Duchess of Cambridge cooks around a campfire during a visit to a Scout camp Credit: PA Wire

As snowflakes were blown around the fells above Lake Windermere at the Great Tower activity centre near Newby Bridge, the temperature was estimated to have plummeted to minus five with the wind chill factor.

Kate, five months pregnant, spent about an hour outside with adult scout volunteers and youngsters.

Kate joined fellow adult volunteers as they trained to work with Beaver and Cub Scouts. Credit: PA Wire

The Duchess of Cambridge joined 24 other adults on a training day to learn scouting skills to pass on to children at their own groups.

As part of the day Kate learnt how to make "twisters" or "dampers".

She kneaded dough in a bowl for several minutes before making elongated twists. After washing the dough mix off her hands Kate wrapped a twist of the messy mixture around a twig stripped of bark which was placed over the open fire ready to toast.

The Duchess of Cambridge cooks around a campfire during a visit to a Scout camp. Credit: The Scout Association

The volunteers' efforts had mixed results, with the Duchess laughing and giggling with the others as some of the twisters dropped into the flames.

"I'm not sure if these are going to look particularly edible," Kate laughed.

After several minutes toasting on the fire Kate pulled off a piece of the bread and, rather gingerly, popped it in her mouth. "Oh, its actually not bad," she told the group. "It is quite sugary though."